4-Point Singleton is a Pokémon TCG format centered around building a 60-card singleton deck from cards released in Expanded-legal sets.
Bans are used sparingly, prefering to give overpowered cards a point value instead. Your deck cannot contain more than 4 points' worth of cards. (Your deck may contain one 4 point card, two 2 different point cards, four different 1 point cards, etc...)
This is similar to how the 殿堂 (Hall of Fame) format played in Japan functions, except played as a singleton format, and with legality starting from Black & White.